external interrupt address

[sush]

if an timer overflow generates interrupt , the controller goes to location
ORG 0x04
so,when an external interrupt is generated where will the controller jump to ,i mean which address

org......?
and if it is same 0x04 ,then how will microcontroler differentiate between the two interrupts?

m using pic16f628a and pic16f877a

thanks

 

[andreid]

You have to test the interrupt flag in order to know which interrupt occurred.

 

[UroBoros]

Hai

Your main portion or ISR should be in 04h

right there you will back up all the critical registeres .

After that you will poll each of the unmasked interrupt flags one by one and branch accordingly. (One major diference from 8051)

So PIC hardware in case of Jump will not differentiate between different interrupts,Your software will have to .

with regards
picstudent